| NOUN | communication | spectrum line | an isolated component of a spectrum formed by radiation at a uniform frequency |
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| Meaning | An isolated component of a spectrum formed by radiation at a uniform frequency. | |
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| Part of | spectrum | An ordered array of the components of an emission or wave |
| Narrower | fine structure | The presence of groups of closely spaced spectrum lines observed in the atomic spectrum of certain elements |
| Broader | line | A mark that is long relative to its width |
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